[New patent introduction] A flow limiting valve for a thermal gas meter

Today, I will introduce a national invention authorized patent-a restrictor valve for a thermal gas meter. The patent was applied for by Golden Card Smart Group Co., Ltd., and the authorization was announced on August 3, 2018.

Content description

The utility model relates to a valve for air flow control, in particular to a flow limiting valve of a thermal gas meter.

Background of the invention

At present, the control valves used in domestic gas meters are mainly screw valves and quick-closing valves. Quick-closing valves are divided into back-pressure quick-closing valves and non-back-pressure quick-closing valves. The working pressure of the quick-closing valve without back pressure is determined by the area of ​​the closing valve spring and the valve cover, so it is only suitable for occasions with low pressure. If in order to achieve high pressure, the spring force can be increased, which will bring about the problem of high power consumption. Quick-closing valve with back pressure can be used in high working pressure occasions, but the relative pressure loss is relatively large. The screw valve has the advantages of simple structure and low pressure loss.

The patent number is 201621440477. 2, which discloses a gas meter control valve structure, which includes a reducer and a valve holder. A partition and a guide sleeve are arranged in the valve holder cavity. The partition is L-shaped in side view, and the upper part of the partition is connected with the valve. The central axis of the frame cavity forms an angle α, the upper part of the partition plate is provided with a vent hole, the guide sleeve is connected with a rack rod, one end of the rack rod is connected with the rack and the reducer, and the other end is a rod connected with a valve seal. The vent hole can be opened and closed, and the guide sleeve is sleeved with the relevant valve spring. The utility model solves the technical problems of high manufacturing cost and high power consumption of the gas meter control valve in the prior art. The utility model has the beneficial effects that most of the particles pass through with the gas, and a small part of them fall into the back of the valve seal, keeping the connecting surface of the valve seal clean, and the sealing performance of the valve does not decrease in long-term use. A large valve opening stroke is realized in a small volume, the flow path space is increased, the pressure loss of the valve is reduced, and the gas meter is miniaturized. Reduce valve opening power consumption, low manufacturing and use costs.

However, the contact form between the valve seal 4 and the partition 32 is line/surface contact, so there may be a certain lack of sealing.

Summary of the invention

The purpose of the utility model is to provide a restrictor valve of a thermal gas meter. Through the cooperation between the sealing convex ring and the sealing groove, the sealing convex ring is pressed against the sealing groove when there is internal pressure inside the gas meter. Stronger airtightness.

In order to achieve the above-mentioned purpose of the invention, the present utility model adopts the following technical solution: a flow limiting valve of a thermal gas meter, comprising a valve holder and a valve seal, the valve holder includes a sealing plate, and the surface of the sealing plate is provided with a through The valve seal includes a valve boss for closing the vent hole, the valve seal further includes an annular backing plate, the ring backing plate is located on the outer periphery of the valve boss, and the ring backing plate is disposed facing the surface of the sealing plate. There is a convex sealing convex ring, the surface of the sealing plate facing the sealing convex ring is provided with a sealing groove for embedding the sealing convex ring, the sealing groove and the sealing convex ring are both annular, and the cross-sectional shape of the sealing groove is the same as that of the sealing convex ring. Corresponding to the cross-sectional shape.

Preferably, the sealing convex ring is in the shape of a conical ring, and the cross section of the sealing convex ring is in the shape of "冫". When the valve seal is ejected and contacts the sealing plate, the conical structure of the sealing convex ring can make it easier to guide and align the seal. Groove, so that the sealing convex ring enters the sealing groove. The sealing convex ring is further provided with a convex ring on the surface facing the sealing plate, and the groove bottom of the sealing groove is also provided with an embedding groove for embedding the convex ring, and the cross section of the convex ring and the embedding groove are both semi-circular or semi-elliptical. . The convex ring and the embedding groove are used to further guide the position of the sealing convex ring to make it straight, and at the same time increase the contact area and increase the sealing performance.

The sealing convex ring is provided with a first chamfer for guiding into the sealing groove, and the first chamfer is located on the edge of the outer side of the sealing convex ring; the sealing groove is provided with a first chamfer for guiding the sealing convex ring into Two chamfers, the second chamfer is located on the edge of the opening on the outside of the sealing groove. Both the first chamfer and the second chamfer are for improving the guidance of the sealing convex ring so that it can accurately enter the sealing groove.

The valve boss is in the shape of a truncated cone, the vent hole is a tapered hole, and the taper of the vent hole is the same as the taper of the valve boss. The valve boss and the vent hole can be in better contact with each other to play a sealing role. The height of the protrusion of the convex ring is 0.3 to 0.7 times the height of the protrusion of the sealing convex ring. The width of the sealing convex ring is 0.1 to 0.4 times the width of the annular backing plate. The depth of the sealing groove is 0.3 to 0.5 times the thickness of the sealing plate.

Compared with the prior art, the flow limiting valve of the thermal gas meter adopting the above technical scheme has the following beneficial effects:

By adopting the restrictor valve of the thermal gas meter of the present invention, the sealing convex ring is matched with the sealing groove to achieve a larger sealing contact area and better sealing performance, especially when there is a certain internal pressure inside the gas meter. The internal pressure forces the annular backing plate to deform and press against the sealing plate side, and the sealing convex ring is compressed in the sealing groove, so that the sealing performance is better.

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